/Engine/Plugins/Importers/USDImporter/Source/UnrealUSDWrapper/Public/USDListener.h
Analogous to pxr::SdfChangeList::Entry::_Flags
struct FPrimChangeFlags
bool:  1
bDidAddInertPrim
bool:  1
bDidAddNonInertPrim
bool:  1
bDidAddProperty
bool:  1
bDidAddPropertyWithOnlyRequiredFields
bool:  1
bDidAddTarget
bool:  1
bDidChangeAttributeConnection
bool:  1
bDidChangeAttributeTimeSamples
bool:  1
bDidChangeIdentifier
bool:  1
bDidChangePrimInheritPaths
bool:  1
bDidChangePrimReferences
bool:  1
bDidChangePrimSpecializes
bool:  1
bDidChangePrimVariantSets
bool:  1
bDidChangeRelationshipTargets
bool:  1
bDidChangeResolvedPath
bool:  1
bDidReloadContent
bool:  1
bDidRemoveInertPrim
bool:  1
bDidRemoveNonInertPrim
bool:  1
bDidRemoveProperty
bool:  1
bDidRemovePropertyWithOnlyRequiredFields
bool:  1
bDidRemoveTarget
bool:  1
bDidRename
bool:  1
bDidReorderChildren
bool:  1
bDidReorderProperties
bool:  1
bDidReplaceContent